# Service lines: Cast iron and ductile iron.

- **operation:** document
- **citation:** 49 CFR 192.373
- **title:** Service lines: Cast iron and ductile iron.
- **source type:** regulation
- **agency:** Pipeline and Hazardous Materials Safety Administration
- **status:** current
- **official:** true
- **published on:** Not available
- **effective on:** 2026-08-18
- **summary:** (a) Cast or ductile iron pipe less than 6 inches (152 millimeters) in diameter may not be installed for service lines.

(b) If cast iron pipe or ductile iron pipe is installed for use as a service line, the part of the service line which extends through the building wall must be of steel pipe.

(c) 
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- **markdown:** https://regulus.evalyn.ai/document/49-cfr-192-373.md
- **app url:** https://regulus.evalyn.ai/document/49-cfr-192-373
- **source url:** https://www.ecfr.gov/on/2026-08-18/title-49/section-192.373
**body:**

(a) Cast or ductile iron pipe less than 6 inches (152 millimeters) in diameter may not be installed for service lines.

(b) If cast iron pipe or ductile iron pipe is installed for use as a service line, the part of the service line which extends through the building wall must be of steel pipe.

(c) A cast iron or ductile iron service line may not be installed in unstable soil or under a building.

[35 FR 13257, Aug. 19, 1970, as amended by Amdt. 192-85, 63 FR 37503, July 13, 1998]
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- **body characters:** 485